A mixture of 8-bromo-7-fluoro-3-methyl-2-((1-methylcyclobutyl)amino)quinazolin-4(3H)-one (502a, 120 mg, 0.353 mmol), (R)-6-methyl-2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-5,6-dihydropyrrolo[3,4-b]pyrrol-4(1H)-one (705, 237 mg, 0.705 mmol), bis(di-tert-butyl(4-dimethylaminophenyl)phosphine)-dichloropalladium (II) (12.49 mg, 0.018 mmol), and potassium phosphate (225 mg, 1.058 mmol) in 1,4-dioxane (2.82 mL)/water (0.70 mL) was sparged with nitrogen for 3 min at RT; the red reaction mixture was then heated to 80° C. for 45 min. The reaction mixture was diluted with EtOAc (100 mL), added to a separatory funnel, and washed with saturated aqueous NaHCO3 (2×100 mL); the organic layer was separated, dried over Na2SO4, and concentrated. The crude product was loaded onto the column and was purified via automated flash chromatography (silica gel) with 0-5% 2 M ammonia in MeOH/DCM to give (R)-7-fluoro-3-methyl-8-(6-methyl-4-oxo-1,4,5,6-tetrahydropyrrolo[3,4-b]pyrrol-2-yl)-2((1-methylcyclobutyl)amino)quinazolin-4(3H)-one (502, 24 mg, 0.061 mmol, 17% yield) as an off-white solid. 1H NMR (400 MHz, CDCl3) δ ppm 1.58 (s, 3H) 1.78 (s, 3H) 1.98-2.15 (m, 2H) 2.27-2.42 (m, 3H) 2.42-2.52 (m, 1H) 3.56 (s, 3H) 4.69 (q, J=6.65 Hz, 1H) 5.08 (s, 1H) 6.01 (s, 1H) 7.00 (dd, J=11.54, 8.80 Hz, 1H) 7.08 (d, J=4.11 Hz, 1H) 8.01 (dd, J=8.80, 6.06 Hz, 1H) 12.76 (br. s., 1H). 19F NMR (376 MHz, CDCl3) δ ppm −99.57 (s, 1F). MS (ESI, pos. ion) m/z: 369.0 (M+1).
